//==============================================================================
//	
//	Copyright (c) 2002-
//	Authors:
//	* Dave Parker <david.parker@comlab.ox.ac.uk> (University of Oxford, formerly University of Birmingham)
//	
//------------------------------------------------------------------------------
//	
//	This file is part of PRISM.
//	
//	PRISM is free software; you can redistribute it and/or modify
//	it under the terms of the GNU General Public License as published by
//	the Free Software Foundation; either version 2 of the License, or
//	(at your option) any later version.
//	
//	PRISM is distributed in the hope that it will be useful,
//	but WITHOUT ANY WARRANTY; without even the implied warranty of
//	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//	GNU General Public License for more details.
//	
//	You should have received a copy of the GNU General Public License
//	along with PRISM; if not, write to the Free Software Foundation,
//	Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//	
//==============================================================================

package com.prism.e4.rcp.prism;

import com.prism.e4.rcp.parser.ast.ASTElement;

public class PrismLangException extends PrismException {

	public static final int MAX_ERR_STR = 20;

	protected ASTElement e = null;

	public PrismLangException(String s) {
		super(s);
	}

	public PrismLangException(String s, ASTElement e) {
		super(s);
		this.e = e;
	}

	public void setASTElement(ASTElement e) {
		this.e = e;
	}

	public boolean hasASTElement() {
		return e != null;
	}

	public ASTElement getASTElement() {
		return e;
	}

	public String getMessage() {
		String msg = super.getMessage();
		if (e == null)
			return msg;
		String s = e.toString();
		if (s.length() < MAX_ERR_STR) {
			if (e.hasPosition())
				msg += " (\"" + s + "\", " + e.getBeginString() + ")";
			else
				msg += " (\"" + s + "\")";
		} else {
			if (e.hasPosition())
				msg += " (" + e.getBeginString() + ")";
		}
		return msg;
	}

	public String toString() {
		return "Error: " + getMessage() + ".";
	}

	public boolean hasLineNumbers() {
		if (hasASTElement()) {
			if (e.getBeginColumn() != -1 && e.getBeginLine() != -1
					&& e.getEndLine() != -1 && e.getEndColumn() != -1)
				return true;
		}

		return false;
	}

	public int getBeginColumn() {
		if (hasLineNumbers())
			return e.getBeginColumn();
		else
			return -1;
	}

	public int getEndColumn() {
		if (hasLineNumbers())
			return e.getEndColumn();
		else
			return -1;
	}

	public int getBeginLine() {
		if (hasLineNumbers())
			return e.getBeginLine();
		else
			return -1;
	}

	public int getEndLine() {
		if (hasLineNumbers())
			return e.getEndLine();
		else
			return -1;
	}
}

// ------------------------------------------------------------------------------
